Printing-paste.



' UNITED STATES PATENT OFFICE.

Josnr'rrnnmnr, or ELBERFELD, GERMANY, ASSIGNOR "r0 FARBENFAIBRIKEN vonM.

FRIEDR. BAYER & 00.. or ELBERFELD, GERMANY, A CORPORATION or GERMANY.

I No Drawing.

PRINTING-PASTE.

. Ta all'whom'it may concern:

.Be it" known that I, JOsnPH Dninn'r, a citizen of the German 'Emplre, residing at Elberfeld, Germany, have invented new and useful Improvements in Printing-lastes, of i which the following is a specification.

' 'I have made the su rising discovery that 3 the dibenzoyl-l.5-diam noanthraquinone can be used as, a-valuable 'dye for printing the textile fiber. It yields with reducingl and thickening agents valuablepastes wh1c the. fiber yellow shades of excellent fastness.

dye

In order to carry out my invention, I'proceed as followsbthe parts being by wei htz' 100 parts of di enzoyl- 1.5- diaminoant raquinone (10 percent. paste. consisting Of 10% dyestufl and 90% water) are mixed with'74 parts of ytragacanth thickening (65 1000). 1.1'parts of tin or. stals, 7 parts of copperas powder, 8 parts o tartaric acid are added and the paste is well stirred. Print, run through soda lye (18, Be.) at 85,.acidul'ate, rinse and soa at 60 C. A very fast .clearyellow shade is thus obtained which remains unchanged u on boiling with" 10% muriatic acid and a so remains un- -chan ed when touched with. cold concenitrate' sulfuric acid and dilute caustic pot- I jia'sh'andjwhich upon being touched with a gao,

watery solution containing 0.4% of anhydrous hydrosulfite of sodium and 0.8% of caustic sodachan es its colonof yellow to olive fibrownwhic von exposure to air assumes. again its original a peara'nce. Other reducingagents e. g. by rosulfitgs may be used.

compound obta ned by treating dibenzoyl- 1 which upon being touched .wit

- Specification of Letters iatent. Patented Dec, 13, 1910, Application filed April 29, 1909. Serla1No.492,987.

1.5-diaminoanthraquinone with reducing agents'in conjunction with thickening agents characterized by producing' on the textile fiber after oxidation a yel ow shade which remains unchanged upon boiling with 10% 'muriatic acid and'also remains unchanged when touched with cold concentrated sulfuric acid and dilute caustic otash and a-watery solution containing 0.4% of anhydrous hydrosulfite of sodium and 0.8% of caustic soda changes its color of yellow to olivebrown whlch on exposure to air assumes again its original appearance, substantially as described. f r

2. A printing'paste comprising'the'leuco com ound obtained by treating dibenzoyl- 1J5- iaminoanthraquinone with tin crystals, copperas powder and tartar powder in conjunction with thickening agents character- 1zed by producing on the textilefiber after oxidation a yellow shade which remains unchanged upon boiling with 10%muriatic acid and also remains unchan ed when touched with cold concentrated su furic acid and dilute caustic potash and which upon touched with a watery solution consodium and 0.8% of caustic so a changes its. color of yellow to olive-brown which on exposure to air assumes again it s original ap arance, substantially as described.

n testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

JOSEPH DEINET. [n.a] Witnesses: y

' O'rro Komo,

C. J. WR GHT; 

